Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d520638a327f5b6…

MALICIOUS

PDF

35.6 KB Created: 2021-05-23 11:41:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 62968d7728f3d8c563699a7c750cebc6 SHA-1: 07e40d1c9f5de69cac8b7e9acc291c9621bd2d01 SHA-256: 1d520638a327f5b6d7f66eb3ff52e165698a90f161f2666b4f989493ee8ca004
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector for a "Roblox Free Robux" generator. The document body and embedded links suggest a lure to trick users into visiting these sites, which likely host further malicious content or scams. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/roblox-free-robux-game-hack In PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-spin-link_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000320d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320D 24576 bytes
SHA-256: 96d05ea42efe0eb22d591eb46236487eea94a9135dcc1037c10ea41849c2cfaf
font_01_sfnt_off00006a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A99 18088 bytes
SHA-256: 03c92d59c548fbfdae08874221752d30f8caaed88781636bf7d18542e7c5fe52

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